摘要
采用溶液浇铸法制备纳米纤维素/聚乳酸/聚乙二醇三元复合材料,与纯聚乳酸相比,该复合材料的抗张强度和断裂伸长率分别提高了41.2%和38.4%。傅立叶红外(FT-IR)表明聚乙二醇的存在使纳米纤维素和聚乳酸之间形成了强烈的氢键作用,明显改善了纳米纤维素和聚乳酸之间的相容性,提高了界面黏结力。扫描电子显微镜(SEM)观察了复合材料的断面形貌和银纹,发现与纳米纤维素/聚乳酸复合材料相比,三元复合材料的拉伸断面出现明显的拉丝状结构和大面积的银纹。透射电子显微镜(TEM)表明三元复合材料中纳米纤维素在聚乳酸基体内均匀分散,并形成网状结构。
The casting solution was blended with poly（lactic aczd） （PLA）, polyethylene glycol （PEG） and cellulose whiskers, PEG was added to the matrix as compatibilizer to improve the compatibility between the hydrophobic PLA and the hydrophilic cellulose whiskers. The composites obtained by solvent casting methods from N,N-dimethylacetamide （DMAc） were characterized by tensile testing machine, scanning electron microscope （SEM）, transmission electron microscopy （TEM） and Fourier transform infrared spectroscopy （FT-IR）. The tensile strength and the elongation rate at break of the composites increased by 41.2% and 38.4% respectively compared with the pure PLA. FT-IR revealed that the compatibility was improved by the addition of PEG, which was based on the existence of hydrogen bond association between PLA and nano cellulose whiskers. SEM was utilized to examine morphology and properties of the composites. The tensile fractured surface of cellulose whiskers/PLA/PEG composites showed a fibroid morphology and large scale craze. But the PLA/eellulose whiskers composites appeared less craze and brittle fracture surface. TEM showed the cellulose whiskers disperse homogeneously and form netted structure in the PLA matrix.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2011年第B02期69-72,共4页
Journal of Functional Materials
基金
国家重点基础研究发展计划(973计划)资助项目(2010CB732204)
教育部"高等教育学科创新引智计划"资助项目(B08005)
国家林业局"948"引进项目资助项目(2008-4-075)
关键词
纳米纤维素
聚乳酸
复合材料
相容性
nano cellulose whiskers
poly（lactic acid）
composites
compatibility
